BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

Bronzed Cowbird In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsGeneralists

Bronzed Cowbird in Sonoran and Mojave Deserts has collapsed: down 88% on the route-weighted index since 1970.

-88%Since 1970
13Routes In Region
35Years

Notable Signals

long arc declinecomputed index

Bronzed Cowbird has collapsed in Sonoran and Mojave Deserts: down 88% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Bronzed Cowbird in Sonoran and Mojave Deserts is projected to stay roughly flat through 2026, near 0.08 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±219.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2026
0.08Projected 2026 index
0.00–0.3995% range
±219.3%Backtest error
19682026
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20220.090.000.41
20230.090.000.40
20240.090.000.40
20250.080.000.40
20260.080.000.39

Routes In Sonoran and Mojave Deserts

Routes recording Bronzed Cowbird in Sonoran and Mojave Deserts.
FlorenceARIZONA91988
AjoARIZONA82001
New RiverARIZONA42014
Casa GrandeARIZONA42009
Cutter 2ARIZONA22017
LagunaARIZONA12008
LukevilleARIZONA11980
ArabyARIZONA12010
WickenburgARIZONA12021
HopeARIZONA11990
Organ PipeARIZONA11994
Imperial DamCALIFORNIA11984
BrawleyCALIFORNIA12009

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.